<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div class="box">
        <select value="请选择游戏名称">
            <option>请选择游戏名称</option>
            <option>qq炫舞</option>
            <option>qq非常</option>
            <option>lol</option>
        </select>
        <button>搜索</button>
    </div>
</body>

</html>
<style>
    body {
        height: 100%;
        background: #ccc;
    }

    select {
        width: 200px;
        height: 30px;
    }
</style>